<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<script>

    //随机校验码
    //页面加载时，生成随机验证码
    window.onload=function() {
        createCode(4);
    }

    //生成验证码的方法
    function createCode(length) {
        var code = "";
        var codeLength = parseInt(length); //验证码的长度
        var checkCode = document.getElementById("checkCode");
        ////所有候选组成验证码的字符，当然也可以用中文的
        var codeChars = new Array(0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
            'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z');
        //循环组成验证码的字符串
        for (var i = 0; i < codeLength; i++)
        {
            //获取随机验证码下标
            var charNum = Math.floor(Math.random() * 62);
            //组合成指定字符验证码
            code += codeChars[charNum];
        }
        if (checkCode)
        {
            //为验证码区域添加样式名
            checkCode.className = "code";
            //将生成验证码赋值到显示区
            checkCode.innerHTML = code;
        }
    }


    //检查验证码是否正确
    function validateCode()
    {
        var lg=document.getElementById("login");
        var pw=document.getElementById("password");
        //获取显示区生成的验证码
        var checkCode = document.getElementById("checkCode").innerHTML;
        //获取输入的验证码
        var inputCode = document.getElementById("inputCode").value;
        console.log(checkCode);
        console.log(inputCode);
        if (inputCode.length <= 0)
        {
            alert("请输入验证码！");
        }
        else if (inputCode.toUpperCase() != checkCode.toUpperCase())
        {
            alert("验证码输入有误！");
            createCode(4);
        }
        else if(lg.value!="login"||pw.value!="123456"){
            alert("账号或密码错误");
        }
        else if(inputCode.toUpperCase() == checkCode.toUpperCase()&&lg.value=="login"&&pw.value=="123456")
        {

            window.location.href="Init.jsp";
        }
    }
</script>
</head>
<style>
    h1{
        color: rgb(8, 10, 11);
        text-align: center;

    }

    .mytest1{
        width: 270px;
        height:50px;
        border: 2px solid #080a0b;
        border-radius: 15px;
        text-align:center;
        vertical-align:middle;
    }



    body{
    background-image:linear-gradient(to right, #ffc6e2, #ccb4ff);

    }

    .code
    {
        font-family:Arial;
        font-style:italic;
        color:blue;
        font-size:30px;
        border:0;
        padding:2px 3px;
        letter-spacing:3px;
        font-weight:bolder;
        cursor:pointer;
        width:90px;
        height:40px;
        line-height:50px;
        text-align:center;
        vertical-align:middle;
        background-color: #fdffbd;
    }

    div{
        background-color: white ;
        width: 350px;
        height: 400px;
        border-radius: 20px;
        opacity: 0.9;
        margin-left: auto;
        margin-right: auto;
        margin-top: 100px;

    }


</style>
<body>


<div style="text-align:center;vertical-align:middle;">
    <h1>学生用户账号登陆 </h1>
    <input placeholder="请输入登陆账户" id="login" class="mytest1" onkeyup="value=value.replace(/[^\a-\z\A-\Z]/g,'')" >
    <br><br>
    <input placeholder="请输入密码" id="password" class="mytest1" type="password" onkeyup="this.value=this.value.replace(/[^0-9-]+/,'');">
    <br><br>
    <input placeholder="请输入验证码" id="inputCode" style="
        width: 180px;
        height:50px;
        border: 2px solid #080a0b;
        border-radius: 15px;
        text-align:center;
        vertical-align:middle;"
           onkeyup="this.value=this.value.replace(/[\W]/g,'')">

    <span id="checkCode" class="code"  onclick="createCode(4)" ></span><br><br>

    <input type="submit" onclick="validateCode()"  class="mytest1">
</div>
</body>
</html>
